\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{999}-\frac{1}{1000}\)
\(=1-\frac{1}{1000}=\frac{999}{1000}\)
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\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{999}-\frac{1}{1000}\)
\(=1-\frac{1}{1000}=\frac{999}{1000}\)
1/1*2+1/2*3+1/3*4+.......+1/999*1000+1
1-1/2+1/3-1/4+......+1/999-1/1000
500-500/501-501/502-502/503-....-999/1000
1/(1×2) + 1/ ( 2×3) +1/ (3×4) +................+1/(999×1000) +1
1/1*2+1/2*3+1/3*4+...+1/999*1000+1=?
1/1*2+1/2*3+1/3*4+.....+1/999*1000+1
1/1*2 +1/2*3 + 1/3*4 +..........+1/999*1000 +1
1/1*2+1/2*3+1/3*4+..........+1/999*1000+1
1/1*2+1/2*3+1/3*4+...+1/999*1000+1
1/1*2+1/2*3+1/3*4+...+1/999*1000+1